1. ifuse & ideviceinstaller are great tools managing Apps and folders of iOS devices, which are much convenient than accessing them in Windows.

2. c:\users\USERNAME\appdata\local\vitualstore\program files (x86)\ is a virtual mapping to the "program files" folders. In Win 7, a program run as a normal user cannot write to its installation folder, but probably for compatibility, this virtual folder is provided.

3. ssh-keygen -l : to view the fingerprint of your ssh keys

4. testdisk is a very powerful tool for hard drive. Last time I messes up the partition table of my hard drive, and then fixed it using this tool

5. In some version of Chrome, the period symbol in Chinese cannot be displayed correctly. A workaround is to zoom in to 110%.